ET- 34018
LINEAR INTEGRATED CIRCUIT
VOICE SWITCHED SPEAKER-
PHONE CIRCUIT
DESCRIPTION
The Contek KGM34018
speaker-phone integrated circuit
incorporates the necessary functions to produce a high quality
hands-free speaker-phone system. The applications include
household and office speaker-phones, intercom systems, hand
free kit for mobile phones, and others
SOP-28
FEATURES
*All necessary level detection and attenuation controls for a
hand-free telephone included.
*Background noise level monitoring with long time constant.
*Background sound level compensation for transmit and
receive levels as well as the background level.
*Wide operating dynamic range through signal compression.
*On-chip voltage regulators illuminate external regulators for
lining operation.
*Power audio amplifier for typical 100mW output (into 25
ohms)with peak limiting for speaker to minimize distortion.
*Chip Select pin for active/stand by operation.
*Volume control function for external volume control.
*Standard 28-pin plastic DIP and SOP package.
DIP-28
ABSOLUTE MAXIMUM RATINGS
(Ta=25
PARAMETER
V+ terminal Voltage (pin 16)
CS
(pin 18
Speaker amplifier Ground(pin 14)
VLC(pin 24)
Storage temperature
C
,Voltages referred to pin 22
)
VALUE
+12,-1.0
+12,-1.0
+3.0,-1.0
+VCC,-1.0
-65 ~ +150
UNIT
V
V
V
V
C
RECOMMENDED OPERATION CONDITIONS
PARAMETER
V+ Terminal Voltage (pin 16)
CS
(pin 18)
Vcc (pin 20)
VLC(pin 24)
Receive Signal(pin 27)
Microphone Signal(pin 9)
Speaker Amplifier Ground (pin 14)
Ambient Temperature
VALUE
+6.0 to +11
0 to +11
0 to 3.0
0.55VB to VB
0 to 250
0 to 5.0
-10 to +10
-20 to +60
UNIT
V
V
mA
V
mVrms
mVrms
mVdc
C
1
BEIJING ESTEK ELECTRONICS CO.,LTD
ESTEK [ Estek Electronics Co. Ltd ]
